Paper plane with flapping wings - GIF

Paper plane with flapping wings.

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Previously:

https://www.homemadetools.net/forum/...526#post132226
https://www.homemadetools.net/forum/...919#post129443
https://www.homemadetools.net/forum/...286#post121687

Wing is a fin that provides lift. Don't see any lift provided by the flapping paper strips.

I'm surprised that such a simple configuration could stay airborne for so long.